Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
  • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
  • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
  • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/004—Joints; Sealings

Definitions

• the invention relates to a connector according to the preamble of the main claim.
• a connector to compensate for the position tolerance is required in many cases due to the installation situation between the fuel injector and the fuel supply line. This applies in particular to direct-injection internal combustion engines which supply fuel to several fuel injectors via a common fuel line, the so-called fuel rail.
• a fuel injection system with one intermediate piece per injection valve is known;
• the intermediate piece described has two different connections.
• the intermediate piece On one side, the intermediate piece has a connecting piece which can be inserted into an opening in the fuel line.
• a receiving opening is made in the intermediate piece, into which the connection side of the fuel injector can be inserted.
• the receiving opening has in particular an inner one that is identical to the opening of the fuel line Geometry on.
• the intermediate piece acts like an extension of the fuel injector or the connecting piece of the fuel line.
• a circumferential shoulder is attached to the outside of the intermediate piece, with the aid of which the intermediate piece can be connected to the fuel line by means of a holding clip and secured against slipping out.
• the intermediate piece is sealed by two sealing elements, which are usually designed as O-rings.
• the first sealing element which serves to seal the intermediate piece from the fuel line, is arranged in a groove on the connecting piece of the intermediate piece.
• the seal between the fuel injector and the intermediate piece is provided by a second sealing element arranged on the fuel injector.
• a disadvantage of the intermediate piece described is the need to fix the intermediate piece to the fuel rail with a retaining clip. This requires not only an additional step in the assembly of the internal combustion engine, but also additional parts. Another disadvantage of assembly is that the intermediate piece must be used in an oriented manner.
• the limited elasticity of the retaining clip leads to the fact that when the intermediate piece is tilted relative to the fuel line, the intermediate piece is acted upon unevenly with force, so that the sealing element can be crushed and finally the sealing element can fail.
• a further disadvantage is that an additional clamping claw is required in order to fasten the fuel injection valve in the cylinder head of the internal combustion engine.
• the intermediate piece cannot transmit any axial forces and can only compensate for positional tolerances to a limited extent due to the restricted mobility.
• Fuel rails lead to temperature fluctuations, which • can occur during the operation of an internal combustion engine, to relatively large changes in the length of the fuel line and thus, in particular in the case of long fuel rails, to changes in the position of the connecting pieces, which cannot be compensated.
• the connector according to the invention with the characterizing features of the main claim has the advantage that a separate retaining clip is omitted due to the configuration of the connector with two nozzles arranged opposite one another and the contact surfaces formed between them.
• the connector is fixed in terms of its position by the contact surfaces between the fuel injector and the fuel line. Positional tolerances or changes in length of the fuel line due to temperature fluctuations do not lead to asymmetrical force transmission into the sealing elements due to the lack of additional fixation.
• connection piece to be rotated about a defined pivot point. If both contact surfaces are designed in spherical geometry and the centers of the spherical geometries lie in the plane of the sealing elements, the resulting uniform loading of the sealing elements when the connector is tilted is particularly advantageous. This is particularly important for the recurring load caused by the temperature expansion of the rail, since premature wear of the sealing elements is prevented.
• Material costs also save further processing steps, e.g. tapping in the cylinder head for screwing the clamping claw.
• the two sockets of which have an identical geometry, particularly simple assembly is possible.
• the connector can be installed as required. As a result, there is no need to orient the component as an additional step before inserting it.
• Fig. 1 shows a schematic partial section through an embodiment of a connector according to the invention.
• FIG. 1 is a schematic representation of a connector 1 according to the invention for connecting a fuel injector, not shown, with a Not shown fuel line shown.
• the connector 1 according to the invention consists essentially of three sections. A first connecting piece 2, a radially widened area 4 and a second connecting piece 3 are arranged successively in the axial direction.
• the first connecting piece 2 has a reduction in its radial extent in the direction of the end of the connecting piece 1 and thus forms a first shoulder 11.
• a first support disk 9 is arranged on the first shoulder 11, the inner radial extent of which is smaller than the radial extent of the first connector 2 on the side of the enlarged region 4.
• the outer radial extent of the first support washer 9, however, is greater than the maximum radial extent of the first connector 2.
• the outer end of the first connector 2 is designed as a first collar 13, the outer radial extension of which preferably corresponds to the outer radial extension of the first support disk 9.
• the radial extent of the first collar 13 and the first support disk 9 are so much smaller than the inner radial extent of the receiving opening of the adjacent component (e.g. the receptacle connecting piece of the fuel line) that the connecting piece 1 is at a certain angle with respect to that receiving component can be inclined without the first support plate 9 or the first collar 13 abutting the inner wall of the adjacent component.
• the first collar 13 and the first support disk 9 are spaced apart in the axial direction.
• a first sealing element 7 is arranged in the resulting space.
• an O-ring can be used as the first sealing element 7.
• the height and radial extent of the space formed between the first support disk 9 and the first collar 13 are dimensioned in accordance with the nominal size of the O-ring to be used.
• the opposite end of the connector 1 corresponds in structure to the above description.
• a second sealing element 8 is arranged between a second collar 14, which is arranged at the end of the connecting piece 1, and a second support disk 10, which rests on a second shoulder 12.
• the radially outer dimensions are in turn dimensioned such that the second connection piece 3 in the receiving opening of the adjacent component (e.g.
• first and second connecting piece 2 and 3 are preferably identical, so that there is a symmetrical connecting piece 1, the orientation of which does not have to be determined during installation.
• the connecting piece 1 can be made, for example, in several parts.
• the first and second collars 13 and 14 together with the part of the first and second connecting piece 2 and 3, which is reduced in radial expansion, can be designed as individual components and, after the support disks 9 and 10 have been placed on them, can be pressed into the central part of the connecting piece 1 ,
• the support disks 9, 10 are slotted, for example, and the outer diameter is larger than the opening of the adjacent component. Due to the slotted design, the support disks 9, 10 always lie against the outer diameter of the bore of the adjacent component. When the support disks 9, 10 are correctly designed, there is always a gap on the inside diameter for connecting piece 2, 3 of the connecting piece 1.
• a first contact surface 5 is formed, the geometry of which corresponds to a section of a spherical surface.
• the center of this spherical geometry with a first radius Rl is z. B. identical to the intersection of the central axis 18 of the connector 1 and the central plane 19 of the second Sealing element 8.
• the transition of the second nozzle 3 to the expanded area 4 is also formed as a section of a spherical surface, the center of which, for. B. is identical to the intersection of the central axis 18 of the connector 1 with the central plane 20 of the first sealing element 7 and the spherical surface has a second radius R2.
• the two contact surfaces 5 and 6 are each supported on a corresponding surface. the fuel line and the fuel injector. As a result, a force can be exerted on the fuel injector from the fuel line in the axial direction.
• the fuel injector is thus fixed by the connector 1 in the cylinder head.
• the forces required to hold the fuel injector firmly in the cylinder head are absorbed on the side opposite the fuel injector by the fuel line, which is fastened to the internal combustion engine.
• the connecting piece 1 can be inclined between the fuel line and the fuel injector.
• the connecting piece 1 rotates around the two centers of the spherical contact surfaces 5 and 6.
• the spherical geometry of the two contact surfaces 5 and 6 ensures that the contact surface remains uniform.
• the radii of the two contact surfaces 5 and 6 are selected in accordance with the corresponding surfaces on the fuel line and the fuel injection valve.
• a first and a second end face 15 and 16 are formed at the two ends of the connecting piece 1.
• the two end faces 15 and 16 can be selected to be of different sizes. If the two differently sized end faces 15 and 16 are acted upon by the fuel pressure, a resulting force is created on the connecting piece 1 in the direction of the smaller end face 15 or 16. This resulting force can be used to increase the force with which the fuel injector is held in the cylinder head.
• the connector 1 has an inner through hole 17 to ensure the flow of fuel from the fuel rail to the fuel injector.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7679233

Family Applications (1)

Country Status (8)

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Citations (4)

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• 2001
  • 2001-03-27 DE DE10115048A patent/DE10115048A1/de not_active Withdrawn
• 2002
  • 2002-03-27 US US10/296,652 patent/US7083203B2/en not_active Expired - Fee Related
  • 2002-03-27 DE DE50202315T patent/DE50202315D1/de not_active Expired - Lifetime
  • 2002-03-27 KR KR1020027016010A patent/KR100858643B1/ko not_active IP Right Cessation
  • 2002-03-27 JP JP2002575461A patent/JP4227412B2/ja not_active Expired - Fee Related
  • 2002-03-27 CZ CZ20023871A patent/CZ20023871A3/cs unknown
  • 2002-03-27 EP EP02724121A patent/EP1373707B1/de not_active Expired - Lifetime
  • 2002-03-27 WO PCT/DE2002/001130 patent/WO2002077439A1/de not_active Application Discontinuation
  • 2002-03-27 CN CNB028008243A patent/CN1304751C/zh not_active Expired - Fee Related

Patent Citations (4)

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